These are the companion quests in Act 1. Companion quests either directly involve doing something for the companion, recruiting said companion or talking to the companion. Generally, the quests where you have to converse with a companion take place in a specific area. This means that even if the companion is in your party, you'll need to head to the quest location to have the conversation. Since this is Act 1, some of these quests are a must if you want to recruit the particular companion for later quests.